提升水泥砂浆耐酸性能的防护技术研究
The Protection Technology for Improving Acid Resistance of Cement Mortar
浏览量:
关键词：
水泥砂浆；超高性能混凝土；配合比设计模型；水化硬化机理；微观结构
Key words：
Cement mortar; Ultra-high performance concrete; Model of mixture design; Mechanism of hydration and harden; Microstructure
刊期：
2020年3期 No.287 P10-14
DOI：
10.19761/j.1000-4637.2020.03.010.05
文章编号：
基金项目：
国家重点研发计划（2017YFC0405102）。
作者：
钱文勋1,2；贺传卿3，何 旸1,2； 韦 华1,2
单位：
1.南京水利科学研究院，210029；2.水利部水工新材料工程技术研究中心，南京210029； 3.新疆水利水电科学研究院，乌鲁木齐，830000
摘要
摘 要：采用普通硅酸盐水泥、磨细矿渣和粉煤灰等原材料配制了水胶比和矿物掺合料掺量不同的4种砂浆试件，并使用环氧防护涂层对其中1种砂浆进行表面防腐涂刷。将成型的砂浆试件分别浸泡于不同pH值的硫酸溶液中。对比研究了各龄期砂浆的质量变化率和强度变化率以及不同砂浆在侵蚀试验后的表面微观形貌。结果表明，硫酸溶液对水泥砂浆有严重的腐蚀作用，在pH值较低的强酸溶液中，通过降低水胶比的方式并不能显著提升砂浆的抗酸侵蚀能力；含大掺量矿物掺合料的砂浆，其耐酸腐蚀性能有明显提升；pH≥3的中强酸和弱酸环境对水泥基材料的侵蚀作用会有明显减弱；采用环氧涂层可较大幅度提升水泥砂浆的耐酸腐蚀性。
Abstract: Based on the internal and external protection of hydraulic concrete - large amount of mineral admixture strategy and coating protection skills, the research and evaluation of different protections on the improvement of acid corrosion resistance were carried out to provide a support for acid corrosion resistance of relevant hydraulic structures. Four kinds of cement mortar with different W/C and mineral content were made by cement, slag and fly ash. The epoxy protective coating was used on one kind of the mortar, and the mortar specimens were soaked in sulfuric acid solution of different pH values. The quality change rate and intensity change rate of mortar at different ages and the microcosmic appearances of the surface sampled from different mortars after the erosion tests were compared and analyzed. The results show that sulfuric acid solution makes serious corrosive effect on cement mortar, and the ways to reduce the W/C can not significantly enhance the ability to resist acid attack for cementitious materials. The corrosion resistance of mortar can be obviously improved with large amount of mineral admixture and the erosion effect on cementitious materials can be significantly reduced while soaking in the medium-strong or weak acid environment. The epoxy resin can greatly improve the acid corrosion resistance of mortar.
结论
（1）试验采用硫酸进行酸腐蚀环境的模拟，由于水泥水化产物与SO42-反应生成膨胀性产物，故试验中质量变化率对砂浆酸腐蚀程度的敏感度不如强度变化率。
（2）虽然较低水胶比的砂浆密实程度和强度更高，但在强酸腐蚀环境下，对耐蚀性能并没有显著提升；掺入矿物掺合料对于水泥基材料耐酸腐蚀性能提升明显。pH值在2以下的强酸性环境对于水泥基材料的侵蚀均十分严重，但是在pH≥3的腐蚀环境中浸泡1年后砂浆抗压强度可以保持在原强度的80%以上，腐蚀程度明显减轻。
（3）采用环氧腐蚀涂层防护的砂浆，其抗酸腐蚀性能较普通砂浆有较为明显的提升，提高涂刷厚度对防酸效果不显著。
参考文献
[1] 李青青.如何减缓中国的土壤酸化问题[J].中国环境科学, 2010(3):290-295.
[2] PAN L Y,LI Y,LI F L.Experimental Study of Fly Ash Concrete Attacked by Sulphuric Acid[J].Advanced Materials Research,2011,287-290+844-847.
[3] NIU J,NIU D.Experimental study on the neutralization of fly ash concrete attacked by acid rain[C].International Conference on Electric Technology & Civil Engineering,2011.
[4] WANG K,YU L N,CHEN M C.Deterioration of Concrete due to Acid Rain Attack in North China[J].Advanced Materials Research,2013(2):671-674+1676-1679.
[5] 陈梦成,韩英俊,谢力,等.酸雨环境下混凝土中性化及抗压强度研究[J].混凝土,2015(1):9-12.
[6] WANG K,BAO M A,ZHANG H Y.Effect of Mineral Admixtures on Deterioration of Concrete under Acid Rain Attack[J].Journal of Building Materials,2013,16(3):416-421.
[7] DU Y J,WEI M L,REDDY K R,et al.Effect of acid rain pH on leaching behavior of cement stabilized lead-contaminated soil[J].Journal of Hazardous Materials,2014,271(4):131-140.
[8] 尚方毓,胡昉,苏小红.硫酸法白炭黑企业循环经济模式探究[J].无机盐工业,2017,49(11):18-20.
[9] 赵巍巍.模拟硫酸型酸雨对树木幼苗光合与水分生理特性的响应[D].杭州:浙江农林大学,2013.
[10] 张新民,柴发合,王淑兰,等.中国酸雨研究现状[J].环境科学研究,2010,23(5):527-532.
[11] KANAZU T,MATSUMURA T,NISHIUCHI T,et al.Effect of Simulated Acid Rain on Deterioration of Concrete[J].Water Air & Soil Pollution,2001,130(1-4):1481-1486.
[12] POURSAEE A,HANSSON C M.Reinforcing steel passivation in mortar and pore solution[J].Cement & Concrete Research,2007,37(7):1127-1133.
[13] MONTENY J,VINCKE E,Beeldens A,et al.Chemical, microbiological, and in situ test methods for biogenic sulfuric acid corrosion of concrete[J].Cement & Concrete Research, 2000,30(4):623-634.
[14] SUN X,JIANG G,BOND P L,et al.A novel and simple treatment for control of sulfide induced sewer concrete corrosion using free nitrous acid[J].Water Research,2015,70:279-287.
[15] FAN Y F,HU Z Q,LIU J L.Application of ultrasonic wave technology to evaluate the corrosion depth of concrete in acid rain environment[J].Advanced Materials Research,2010,129-131:128-133.
[16] FAN Y F,HU Z Q,ZHANG Y Z,et al.Deterioration of compressive property of concrete under simulated acid rain environment[J].Construction ＆ Building Materials,2010,24(10):1975-1983.
[17] 韦有波.不同类型水泥砂浆的抗酸腐蚀性能研究[J].混凝土与水泥制品,2012(12):62-65.
[18] MONTENY J,BELIE N D,VINCKE E,et al.Chemical and microbiological tests to simulate sulfuric acid corrosion of polymer-modified concrete[J].Cement & Concrete Research, 2001,31(9):1359-1365.
[19] ZHONG S,CHEN Z.Properties of latex blends and its modified cement mortars[J].Cement & Concrete Research,2002, 32(10):1515-1524.
[20] 阴琪翔,侯明姣,杜健民,等.排烟冷却塔防腐涂层对混凝土耐酸腐蚀性影响的试验研究[J].混凝土与水泥制品,2016(7):11-15.
引用本文
钱文勋,贺传卿,何旸,等.提升水泥砂浆耐酸性能的防护技术研究[J].混凝土与水泥制品,2020(3):10-14.
QIAN W X,HE C Q,HE Y,et al.The Protection Technology for Improving Acid Resistance of Cement Mortar[J].China Concrete and Cement Products,2020(3):10-14.
上一个： 石粉含量对超高性能混凝土性能影响研究
下一个： 高温入模条件下侧墙结构混凝土早期收缩裂缝控制技术研究
相关文件